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Alejandro Pacheco
92fc71e908
For a request set up with coap_add_data_large_request_app(), the data is provided by the application's get_func and there is no data pointer. Three places still took the body from that NULL pointer, so coap_add_data() was passed a NULL pointer: - check_freshness(), re-sending the next block with the Echo option from a 4.01 response. - coap_cancel_observe_lkd(), re-adding the observe request's body to the cancel request. - coap_add_data_large_internal(), when the application sets a Block1 option with a non-zero block number to send a single block. Use get_func in all of these, as the other places that send a block of an lg_xmit already do. The single block and the whole-body cases now share add_get_func_data(), which also checks the allocation and no longer leaks the buffer when get_func fails. Add unit tests.